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Refrigerant Piping Connection
4.1 Piping Length
•
.Long refrigerant piping will affect the performance of the unit and shorten the lifespan of the compressor.
In the worst case scenerio, it will cause the compressor to break down.
Piping length should be as short as possible
Caution:
•
Special precautions must be taken when there is no choice but to use longer pipe lengths.
The following table shows the recommended piping length limits
Model
KODH 75-150
•
Accumulator is recommended to be added for any installation more than 32m in length
4.2 Piping Connection
•
To ensure satisfactory operation and performance, the following points should be noted for the field
tubing arrangements of the complete refrigerant cycle.
•
Liquid loops or oil traps must be provided according to the position of the outdoor and the indoor
units (depends on , whether the indoor unit is located above or below the outdoor unit).
•
Filter dryer and sight glass (field supply) must be installed, Sight glass shall be installed after the filter
drier at the liquid line.
•
Pipe shall be installed following tthe size listed in Fig. 3.1
Caution:
• During the preparation, piping shall be properly covered to avoid the containmination of the system.
•
Both indoor and outdoor are brazed connection.
Warning:
• Make sure there is no flammable gas at the surrounding before the brazing work started.
•
Leak test shall be carried out after braze connection.
Warning:
• DO NOT charge in flammable gas.
Vaccuming, Charging & Refrigerant Handling
•
The system shall be thoroughly vaccumed to 1.0 Pa (700mmHg) or lower,to remove the moisture and
dust from the system.
•
The proper refrigerant charge should follow the volume as recommended by manufacturer.
For system optimization, refrigerant should be carefully added to the system until reasonable sub-cooling
is measured in the liquid line and reasonable suction superheat is measured at the compressor suction.
Suction and discharge pressures must be monitored carefully during the charging process.
•
ADDITIONAL CHARGE
when the piping connecting length is exceeding the standard 7m, extra charge shall be added
Based on liquid pipe size per meter length:
Note: Above is the recommendation, actual charge level may be different due to the different application
and ambient condition.
Max. Length
(m)
35
Liquid line size
Kg
1/2"
0.10
5/8"
0.17
Max. Height
Maximum number of
(m)
bends allowed
20
5
10
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